B108D - Understanding the Code and Fixing Issues in Vehicles Like Ford and Honda

Quick Answer

B108D means: B108D indicates a fault in the seat position sensor circuit related to the body control module.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with B108D? Address this code promptly to ensure proper seat functionality and safety features are operational.

Common Questions

What does B108D mean and how does it affect my car?

B108D indicates a problem with the seat position sensor circuit, which can lead to issues with seat adjustments and safety features. It is crucial to address this code to ensure your vehicle operates safely and comfortably.

What are the most common causes of B108D and how much does it cost to fix?

The most common causes of B108D include a faulty seat position sensor, damaged wiring, or issues with the body control module. Repair costs can vary, typically ranging from $100 to $300, depending on the required repairs.

Can I drive my car with B108D or should I stop immediately?

While it may be safe to drive short distances with B108D, it is advisable to get the issue checked as soon as possible. Ignoring this code could lead to more significant electrical issues or safety risks.

How can I diagnose B108D myself using GeekOBD APP?

To diagnose B108D, connect the GeekOBD APP to your vehicle’s OBD2 port, read the trouble codes and any freeze-frame data to understand the context of the issue. Follow up with visual inspections and component testing as needed.

What vehicles are most commonly affected by B108D?

B108D is frequently seen in models like the 2016 Ford Fusion and 2018 Honda Accord. Make sure to check for any recalls or technical service bulletins (TSBs) related to your vehicle.

How can I prevent B108D from happening again?

Regular maintenance, including checking electrical connections and ensuring that seat components are free from wear and tear, can help prevent B108D. Additionally, addressing any signs of electrical issues promptly is crucial.

What is B108D?

DTC B108D is a diagnostic trouble code that indicates a malfunction related to the vehicle's body control module (BCM), particularly concerning the seat position sensor circuit. This code can be triggered in various vehicles, especially in Ford and Honda models produced between 2015 and 2020. The BCM is responsible for managing multiple functions in your car, including power windows, locks, and seat adjustments, which means that when B108D is present, you might experience issues with your power seats or other electronic functions. It typically signifies that the BCM is not receiving the correct signal from the seat position sensor, which can lead to safety concerns, especially if the seat position affects airbag deployment. Ignoring this code can escalate into more serious electrical or operational problems, as the BCM may begin to malfunction in managing other critical systems in the vehicle. Immediate attention is recommended to diagnose the underlying issues causing this trouble code, as it can affect not only the comfort of driving but also the safety of the vehicle occupants.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B108D is present:

  • The check engine light remains illuminated, indicating a problem that requires immediate attention.
  • The power seat may not adjust correctly, making it uncomfortable for the driver or passengers.
  • Intermittent electrical issues with other features such as power windows or door locks.
  • The seat position memory function may not work, causing inconvenience for multiple drivers.
  • In some cases, the airbag warning light may illuminate, indicating potential safety risks.

Possible Causes

Most common causes of B108D (ordered by frequency):

  1. The most common cause of B108D is a faulty seat position sensor, which has a likelihood of about 60%. This sensor may fail due to wear and tear or electrical issues.
  2. Another potential cause is damaged wiring or connectors leading to the seat position sensor, which can disrupt the signal sent to the BCM.
  3. A poorly functioning body control module itself can trigger the B108D code. If the BCM fails, it may misinterpret or lose signals from various sensors.
  4. Less frequently, a software glitch within the BCM could lead to erroneous readings, requiring a software update or reprogramming.
  5. In rare instances, physical damage to the seat or its components could affect the sensor's performance.

B108D Repair Costs

Cost Breakdown by Repair Type

Seat Position Sensor Replacement

Replace the faulty seat position sensor to restore functionality.

  • Total: $150 - $300
  • Success rate: 90%
Wiring Repair

Repair damaged wiring or connectors affecting the sensor's operation.

  • Total: $100 - $200
  • Success rate: 80%
BCM Reprogramming

Reprogram or update the body control module's software to resolve communication issues.

  • Total: $75 - $150
  • Success rate: 85%
Money-Saving Tips for B108D
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional B108D Diagnosis Process

Follow these systematic steps to accurately diagnose B108D. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection of the seat and surrounding wiring for visible damage or corrosion (5-10 minutes)

Step 1: Conduct an initial visual inspection of the seat and surrounding wiring for visible damage or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: Use an OBD2 scanner, such as the GeekOBD APP, to retrieve the B108D code and any related codes to gather more context (10-15 minutes)

Step 2: Use an OBD2 scanner, such as the GeekOBD APP, to retrieve the B108D code and any related codes to gather more context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Perform component testing on the seat position sensor using a multimeter to check for proper voltage and resistance (20-30 minutes)

Step 3: Perform component testing on the seat position sensor using a multimeter to check for proper voltage and resistance (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: Test the BCM’s functionality with specialized tools to ensure it's communicating correctly with the seat position sensor (20-30 minutes)

Step 4: Test the BCM’s functionality with specialized tools to ensure it's communicating correctly with the seat position sensor (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: After repairs, clear the codes using the GeekOBD APP and conduct a road test to verify that the issue has been resolved (15-20 minutes)

Step 5: After repairs, clear the codes using the GeekOBD APP and conduct a road test to verify that the issue has been resolved (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Fixing B108D in a 2017 Ford Fusion

Vehicle: 2017 Ford Fusion, 45,000 miles

Problem: The customer reported that the power seats were not functioning correctly, and the check engine light was on.

Diagnosis: After scanning with the GeekOBD APP, B108D was retrieved. A visual inspection revealed a damaged seat position sensor.

Solution: Replaced the seat position sensor and cleared the codes. The seat adjustments worked perfectly afterward.

Cost: $220 (sensor: $150, labor: $70)

Result: The customer reported satisfaction with the repair, and no further issues were noted in follow-up.

Case Study 2: Resolving B108D in a 2019 Honda Accord

Vehicle: 2019 Honda Accord, 30,000 miles

Problem: The vehicle’s power seat would not adjust, and the airbag warning light was illuminated.

Diagnosis: The GeekOBD APP showed B108D. Further testing indicated faulty wiring between the sensor and the BCM.

Solution: Repaired the damaged wiring and reprogrammed the BCM to ensure proper communication.

Cost: $180 (wiring repair: $100, reprogramming: $80)

Result: The issue was resolved, and the airbag system was confirmed to be operational.

Diagnose B108D

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: B108D
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: MEDIUM
Category: Body Codes